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   源码介绍

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maven中包含 org.bouncycastle和commons-codec

package test9;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.SecureRandom;

import java.security.Security;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

import org.bouncycastle.jce.interfaces.ECPrivateKey;

import org.bouncycastle.jce.interfaces.ECPublicKey;

public class ECCUtil {

	static {

		Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

	}

//生成秘钥对  

	public static KeyPair getKeyPair() throws Exception {

		KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");

		keyPairGenerator.initialize(256, new SecureRandom());

		KeyPair keyPair = keyPairGenerator.generateKeyPair();

		return keyPair;

	}

//获取公钥(Base64编码)  

	public static String getPublicKey(KeyPair keyPair) {

		ECPublicKey publicKey = (ECPublicKey) keyPair.getPublic();

		byte[] bytes = publicKey.getEncoded();

		return test9.UtilHelper.byte2Base64(bytes);

	}

//获取私钥(Base64编码)  

	public static String getPrivateKey(KeyPair keyPair) {

		ECPrivateKey privateKey = (ECPrivateKey) keyPair.getPrivate();

		byte[] bytes = privateKey.getEncoded();

		return test9.UtilHelper.byte2Base64(bytes);

	}

//将Base64编码后的公钥转换成PublicKey对象  

	public static ECPublicKey string2PublicKey(String pubStr) throws Exception {

		byte[] keyBytes = test9.UtilHelper.base642Byte(pubStr);

		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);

		KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");

		ECPublicKey publicKey = (ECPublicKey) keyFactory.generatePublic(keySpec);

		return publicKey;

	}

//将Base64编码后的私钥转换成PrivateKey对象  

	public static ECPrivateKey string2PrivateKey(String priStr) throws Exception {

		byte[] keyBytes = test9.UtilHelper.base642Byte(priStr);

		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);

		KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");

		ECPrivateKey privateKey = (ECPrivateKey) keyFactory.generatePrivate(keySpec);

		return privateKey;

	}

//公钥加密  

	public static byte[] publicEncrypt(byte[] content, PublicKey publicKey) throws Exception {

		Cipher cipher = Cipher.getInstance("ECIES", "BC");

		cipher.init(Cipher.ENCRYPT_MODE, publicKey);

		byte[] bytes = cipher.doFinal(content);

		return bytes;

	}

//私钥解密  

	public static byte[] privateDecrypt(byte[] content, PrivateKey privateKey) throws Exception {

		Cipher cipher = Cipher.getInstance("ECIES", "BC");

		cipher.init(Cipher.DECRYPT_MODE, privateKey);

		byte[] bytes = cipher.doFinal(content);

		return bytes;

	}

	public static void main(String[] args) throws Exception {

		KeyPair keyPair = ECCUtil.getKeyPair();

		String publicKeyStr = ECCUtil.getPublicKey(keyPair);

		String privateKeyStr = ECCUtil.getPrivateKey(keyPair);

		System.out.println("ECC公钥Base64编码:"   publicKeyStr);

		System.out.println("ECC私钥Base64编码:"   privateKeyStr);

		ECPublicKey publicKey = string2PublicKey(publicKeyStr);

		ECPrivateKey privateKey = string2PrivateKey(privateKeyStr);

		byte[] publicEncrypt = publicEncrypt("hello world".getBytes(), publicKey);

		byte[] privateDecrypt = privateDecrypt(publicEncrypt, privateKey);

		System.out.println(new String(privateDecrypt));

	}

}